I had a 1969 Islander (Crealock) excaliber 26, there was a open Islander owners group at one time, but I think they went to a members only yahoo group much like the Tayana Owners group.
The original site did have some good info, but can't say about the yahoo group
If your Bahama, was anything like my excaliber, you got a great boat, I wish I still had mine
Here's a site to try
islandersailboats : Islander Sailboat Forum
Don't know if it's the original group or not